Ferro Silicon Composition

Main components: iron, silicon
Other elements: aluminium, calcium, phosphorus, sulphur, manganese, carbon

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Product Introduction

Products Description

Ferro silicon is a kind of iron alloy with iron and silicon as the main components, and its composition is divided into several grades according to the silicon content. The composition of ferro silicon directly affects its metallurgical properties and uses. High-purity ferro silicon can be applied to high-end steel grades and special alloys, while ordinary ferro silicon is widely used in the steel and foundry industries. The main methods for testing the composition of ferro silicon are chemical analysis or spectral analysis. These methods can accurately determine the content of each element in ferro silicon to ensure that it meets industrial standards and usage requirements.

Common Grades

Grade	Silicon content (Si)	Carbon content (C)	Aluminium content (Al)	Phosphorus content (P)	Sulphur content (S)
FeSi45	40%~47%	≤0.2%	≤2%	≤0.04%	≤0.04%
FeSi75	72%~80%	≤0.2%	≤1.5%	≤0.04%	≤0.02%
FeSi90	87%~95%	≤0.1%	≤0.5%	≤0.04%	≤0.02%

Products Description

Silicon (Si)

The content of silicon is about 15 to 95 per cent. Silicon is the core element of ferrosilicon and determines the properties and uses of the alloy. Higher silicon content of high silicon ferrosilicon is mainly used in steel making deoxidation and production of magnesium metal, low silicon ferrosilicon is mainly used in foundry industry.

Iron (Fe)

The content of iron is about 5 to 85 per cent. Iron is the basic element of ferrosilicon and forms a stable alloy structure with silicon. Iron content varies with silicon content, the higher the silicon content, the lower the iron content.

Main impurities

These impurities affect the performance and quality of ferrosilicon, and the impurity content should be strictly controlled during production.

Carbon (C)

The content of carbon element is about 0.05%-2%. Excessive carbon content reduces the deoxidising ability of ferrosilicon and affects steel properties. Low carbon ferrosilicon can be used to make stainless steel.

Aluminium (Al)

The content of aluminium element is about 0.5%-2%. Aluminium also reduces the deoxidation efficiency of ferrosilicon and may increase inclusions in the steel. High purity ferrosilicon requires an aluminium content of ≤0.5%.

Phosphorus (P)

The content of the element phosphorus is approximately ≤0.04%. Phosphorus is a harmful element in steel, and this element reduces the toughness and weldability of steel.

Sulphur (S)

The content of primary sulphur is approximately ≤0.02%. Sulphur causes thermal embrittlement of steel and needs to be strictly controlled.